Missing Controller

Error: Ust.gifController could not be found.

Error: Create the class Ust.gifController below in file: app/controllers/ust.gif_controller.php

<?php
class Ust.gifController extends AppController {

	var $name = 'Ust.gif';
}
?>

Notice: If you want to customize this error message, create app/views/errors/missing_controller.ctp